豆腐の角に頭をぶつけて死ね

Japanese: Reading: toufu-no kado-ni atama-wo butsukete shine
Meaning: curse-expression
Literally: bash your head against a corner of a block of tofu and die

Interestingly enough, tofu is soft so there is a debate about whether or not this way of dying is actually possible. Maybe even in cursing, the Japanese people are still avoiding directness and so the method of dying is left obscure...

(Quelle: http://nihongoshticks.blogspot.de/2011/05/death-by-tofu.html)